<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片区域 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert :closable="false" show-icon title="注意:只允许为第三级分类设置相关参数!" type="warning">
            </el-alert>

            <!--选择商品分类区域-->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类:</span>
                    <!--选择商品分类的级联选择框-->
                    <el-cascader v-model="selectCateKeys" :options="catelist" :props="cateProps"
                        @change="getParamsData"></el-cascader>
                </el-col>
            </el-row>
            <!-- tab 页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button @click="addDialogVisible = true" :disabled="isBtnDisabled" type="primary"
                        size="mini">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template v-slot="scope">
                                <!-- 循环渲染的tag标签 -->
                                <el-tag @close="handleClose(i, scope.row)" closable
                                    v-for="(item, index) in scope.row.attr_vals" :key="index">
                                    {{ item }}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+
                                    New
                                    Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template v-slot="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit"
                                    @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete"
                                    @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button :disabled="isBtnDisabled" type="primary" size="mini">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template v-slot="scope">
                                <!-- 循环渲染的tag标签 -->
                                <el-tag @close="handleClose(i, scope.row)" closable
                                    v-for="(item, index) in scope.row.attr_vals" :key="index">
                                    {{ item }}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+
                                    New
                                    Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template v-slot="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit"
                                    @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete"
                                    @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>


        <!-- 添加参数对话框 -->
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <el-form :model="addFrom" :rules="addFromRule" ref="addFromRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addFrom.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>


        <!-- 编辑参数对话框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <el-form :model="editFrom" :rules="editFromRule" ref="editFromRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editFrom.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>



    </div>
</template>
<script>
export default {
    data() {
        return {
            //商品分类列表
            catelist: [],
            //级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            //级联选择框双向绑到的数组  
            selectCateKeys: '',
            //被选中的页签
            activeName: 'many',
            //动态参数的数据
            manyTableData: [],
            //静态参数的数据
            onlyTableData: [],
            //添加对话框的控制和隐藏
            addDialogVisible: false,
            //添加参数的表单数据对象
            addFrom: {
                attr_name: ''
            },
            //添加参数的表单数据验证规则
            addFromRule: {
                attr_name: [
                    { required: true, message: '请输入', trigger: 'blur' },
                ]
            },
            //控制修改对话框的显示和隐藏
            editDialogVisible: false,
            //修改的表单数据对象
            editFrom: {

            },
            editFromRule: {
                attr_name: [
                    { required: true, message: '请输入', trigger: 'blur' },
                ]
            },

        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        async getCateList() {
            this.catelist = await this.$gethp('get', 'categories')
        },
        //级联选择框选中项变化，会触发这个函数
        async getParamsData() {
            //证明选中的不是三级分类
            if (this.selectCateKeys.length !== 3) {
                this.selectCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            //证明选中的是三级分类
            const rs = await this.$gethp('get', `categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
            rs.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                item.inputVisible = false
                item.inputValue = ''
            });
            console.log(rs);
            if (this.activeName === 'many') {
                this.manyTableData = rs
            } else {
                this.onlyTableData = rs
            }

        },
        //监听添加对话框的关闭事件
        handleTabClick() {
            this.handleChange()
        },
        addDialogClosed() {
            this.$refs.addFromRef.resetFields()
        },
        //点击按钮,添加参数
        addParams() {
            this.$refs.addFromRef.validate(async valid => {
                if (!valid) return
                await this.$hp('post', `categories/${this.cateId}/attributes`, {
                    attr_name: this.addFrom.attr_name,
                    attr_sel: this.activeName
                }, 201)
            })
            //重新刷新列表
            this.getParamsData()
            this.addDialogVisible = false
        },
        async showEditDialog(id) {
            this.editFrom = await this.$gethp('get', `categories/${this.cateId}/attributes/${id}`, { params: { attr_sel: this.activeName } })
            this.editDialogVisible = true
        },
        //重置表单
        editDialogClosed() {
            this.$refs.editFromRef.resetFields()
        },
        //点击按钮,修改参数信息
        editParams() {
            this.$refs.editFromRef.validate(async valid => {
                if (!valid) return
                await this.$hp(
                    'put',
                    `categories/${this.cateId}/attributes/${this.editFrom.attr_id}`,
                    {
                        attr_name: this.editFrom.attr_name,
                        attr_sel: this.activeName
                    }
                )
                this.getParamsData()
                this.editDialogVisible = false
            })

        },
        //点击按钮,删除参数信息
        async removeParams(attr_id) {
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            //取消了此次操作
            if (confirmResult !== 'confirm') return this.$message.info('取消此次操作')
            await this.$hp('delete', `categories/${this.cateId}/attributes/${attr_id}`)
            this.getParamsData()
        },
        //文本框失去焦点或 按下 Enter 键都会触发
        async handleInputConfirm(row) {
            if (row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            this.saveAttrVals(row)

            row.inputVisible = false

        },
        //获取编辑后提交的参数
        async saveAttrVals(row) {
            await this.$hp('put',
                `categories/${this.cateId}/attributes/${row.attr_id}`,
                {
                    attr_name: row.attr_name,
                    attr_sel: row.attr_sel,
                    attr_vals: row.attr_vals.join(' ')
                }
            )
        },
        //点击按钮,展示文本输入框
        showInput(row) {
            row.inputVisible = true
            //让文本框自动获得焦点
            //$nextTick方法的作用,
            //就是当页面上元素被重新渲染之后
            //才会指定回调函数中的代码

            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        //删除对应的参数可选项
        handleClose(i, row) {
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)

        }
    },
    computed: {
        isBtnDisabled() {
            if (this.selectCateKeys.length !== 3) return true
            return false
        },
        //当前选中的三级id
        cateId() {
            if (this.selectCateKeys.length === 3) return this.selectCateKeys[2]
            return null
        },
        titleText() {
            if (this.activeName === 'many') return '动态参数'
            return '静态属性'
        }
    }
}
</script>
<style lang="less" scoped>
.cat_opt {
    margin: 15px 0;
}

.el-tag {
    margin: 10px 15px;
}

.input-new-tag {
    width: 120px;
}
</style>